Here are some resources you can use for your lesson design:

General Science
http://www.sciberdiver.edu.sg/: Resources and activities aligned to our Singapore primary and lower sec science syllabus
http://www.stevespanglerscience.com/: Many activities, videos, etc to make Science fun!
http://www.howstuffworks.com/: How just about anything works!

Physics
http://phet.colorado.edu/simulations/: A set of animations created by Colorado University

Creating rubrics
http://rubistar.4teachers.org/ - contributed by Wee Chong (Thanks!)

Creating concept maps
http://www.stanford.edu/dept/SUSE/projects/ireport/articles/concept_maps/The%20Theory%20Underlying%20Concept%20Maps.pdf